Drafting device



July 3, 1923. 1,460,497 o. E. NOBLE DRAFTING DEVI CE File d April 4. 1922 2 Sheets-Sheeb 2 4 11v VE/VTOR 'T-square or Patented July 3, 1923.

UNITED STATES OLIVER E. NOB E, or MANHA TAN, KANSAS.

DRAFTING DnvIcE.

fApplication filed April 14, 1922. Serial-No. 552,697.

To all whom it may concern:

Be it known that I, OLIVER E NOBLE, a citizen of the -United States, residing at Manhattan, in the county of-Riley. and State of Kansas, have invented certain new and useful Improvements in Drafting Devices; and I do declare'thefollowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art towhichit appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification. 1;

This invention relates to a drafting instrument, the primary object being to provide a novel, easily operated, inexpensively constructed device capable of meeting the requirements of a draftsman and among'the manifold advantages, of: the invention is the provision of means for assisting the drafts- In'an in making relatively large letters for drawings, maps or the like or for outlining them for signpainting, to more easily per mit the plotting of maps and. transverse lines, to provide means for accurately shading cross hatching and similar operation, to assist in making ellipses, and v to provide means whereby relatively large circles may be accurately made,

The device in some of its operations may be used alone or it may be combined with a parallel ruler to serve as a guide. a

The device can be associated in different ways without the T-square or parallel'r-uler but Iprefer to utilize it in'connection with a T-square because the T-squar'e particularly lends itself for'use as a complementary member or guide and for that reason I have illustrated it in connection with a T-square rather than with a parallel ruler or rather than showing it to be guided by the lower edge of the drawing board. 7

In the drawings, Fig. 1 is a plan view of the ciated with a T-square. 4 V

Fig. 2 is a sectional viewon the line 2:2 of Fig. 1, showing the T-square in edge ele vation. I 1

Figs. 3.and 3 are vertical,..longitudinal, sectional views through the device and a cross sectional view through the long arm of the T-square, and 4 iig. 4 is a plan view ofaprotractor.

device asso Referring now to the drawings by numerals 9f reference: I -l designates a T-square of conventionalform, which may serve as a guide for the device; constituting the subject matter ofmy invention. Guided upon the'long blade or arm 1 of the T-square 1 is a. base plate 2 7 having at its respective ends anti-friction rollers 3 and 4 mounted in bearings 5, 6, 7 and Sat the ends of the slots 9 and 10.

The rollers are longenough to extend the width of the long blade 1 of the T-squar'e 1 and the base plate may-be 'guidedagainst lateral movement by guide rollers 11 and 12 on the top edge of the blade 1 and'the guide roller 13 at the lower edge of the blade 1', the rollers 11, '12 and '13-being "mounted be' low the plate 2, as will be seen in Fig. 3.

Cushions or rests 14, 15, 16 and 17 may provided on the bottom face of the plate 2 and these cushions may extendslightly be low the rollers 11, 12 and '18 so-that when the device is used independently of the T- square, the rests will serve as supports .or

feet for the plate 2. I They are, therefore, preferably constructed of resilient material,

such as rubber or the like.

' The center of theplate 2 has a' 'hea'rtshapedopening-IS, at the edge of which is a projection 19, having a-threaded opening 20 to receive the threaded end'2l of asecurits upper edge to engage in the shouldered portion 24 of' a circumferential plate 25,- which is also provided with a heart-shapedv opening 26, corresponding to the opening' 18 to provide an opening through which the nut 22 projects so that thetwo plates can be secured together. It will be observed,.however, that the nut 22 is threaded intothe ing nut 22, having a peripheralifiange 23 at plate 2 and loosely secures theplate 25 to it so that the plate'25 canturn about the-axis of the nut. Therefore, 'the'plate 2is stationary while the plate is rotatably mounted thereon. a About the plate 25 is a protractor ring 27, calibrated at 28 for degrees of' angularityand having an indicating scale 29 for letters to show the angle'at which theparts of the letters are to beformed, as will be presently explained. V Mounted .on the plate land adjacent to, the perimeter of the ring 2 is a locking lever 30, adapted to bind against the perimeterof the ring27. Therefore, the ring-27 canbe held against rotation while the plate 25 can be rotated. The plate 25 carries two longitudinalguides 31 and 32 between which is a longitudinally movable, sliding frame 33. The side bars 34 and 35 of the frame are connected at their respective ends by cross bars 36 and 37 and at one end of the frame 33 is a socket 38 to receive a projection 39 on a hand rest or support 40, which is provided with upstanding, curved horns or pro jections 41 and 42, the forward end of the table having a pin supporting arm 43 provided with a bifurcation 44 at its end to constitute a pen seat so that a pen can rest inthe seat 44 to draw a line when the sliding frame 33 is moved longitudinally.

The horns or projections 41 and 42 are to be grasped by the thumb and third and third and fourth fingers to steady the hand of the operator upon the table when the pen is held by him in the seat 44.

The table or hand rest "40 can be removed and in'its place maybe introduced the projection 45 on the protractor frame 46, the protractor arm 47 being swingingly mounted in the circular seat 48 in the usual way. The protractor may be substituted for the hand rest whenever it is desired to cross hatch or section line, draw transverse lines or vary the angle-incident to drafting work, the table being used primarily for letterlng.

The guide 32 carries a locking lever 49 to frictionally engage the side bar 35 of the frame 33 so that it may be locked in any .position when the protractor is used. The locking lever 49, however, will not be employed when it is desiredto make the letters because in making the letters at will'be necessar-yto slide the frame back and forth.

The frame may also be progressively moved in the guides 31 and 32 in section lining, crosshatching and the like,'and in order to provide means for moving the straight'edge uniform distances for the purpose of section lining, cross hatching, shading'or the like, I provide a ratchet'mechanism consist-ingof four bars 50, 51, 52 and 53. These are supported by the cross'bars 5'4'and 55 and each barhas a plurality of teeth 56 on its lower edge, the spaces between the teeth of each bar being different so that when the dogor detent 57 is caused to engage the teeth on one bar, the frame 33 can be moved a different distance than when it is engaging the teeth on another bar.

The'detent is 'frictiona'lly mounted on a cross-rod or support 58, journaled in bearings 59 and 60 on the lower side of the guides31 and 32 andone end of the bar 58 is provided with a crank 61, by means of which the detentcan be moved out of engagement with the teeth by rocking the bar slightly.

The detent is slidable'transversely of the frame or longitudinally of the bar 58 so that it can be-caused to align with any oneof the ratchet bars 50,51, 52 or 53, the particular bar selected determining the distance that the frame 33 will move when it is advanced one tooth with "respect to the bar and gauge. For example, if close section lining is to be had, the detent will be under the bar 50. If wider cross hatching, section lining or shading is to be provided, the detent will he slid along the rod '58 until it comes under the bar 51. If still wider spaces are to be provided, the teeth will beunder 52 and if wider spaces are desired, under 53. The operator can push the frame forward until the tooth of the teeth clicks under the next succeeding tooth, when he will know that he has moved the frame 33 one space, and such spacing may continue until it is desired to change the sizeofthe spacing, when 1t)he detent must be shifted to another ratchet When it is desired to move the frame freely, the crank 61 will be usedto tilt the bar 58 to move the detent out ofengagement with any ratchet bar so that there can be free sliding movement of the "frame 33.

I have also providedaneans forassisting in constructing ellipses andin order to provide an ellipsograph as partof the invention, I extend from one edgeof-theplate 2 a guide consisting of the two bars 62 and 63, in which is a sliding plate 64. The sliding plate carries a rod clip 65, slidablymounted on alongitudinal rod 66 pivoted-at 67 to a transverse bar 68 adjustable-on the side-bars 34 and 35. The bar 68 has dependingends which lap over the edges of the side bars 34and 35 in the form 'of'an inverted .U and in one of these bars is asetscrew69, (see Fig. 1) which canbe manipulated to-bindthe'bar on the sliding frame 33 at any position :dependent upon the size of the ellipse. The clip is also provided with a set screw 70, whereby the Y clip can be adjustably secured on the rod 66. Therefore, when it is desired to form an ellipse, the size of the ellipse will be determined by the adjustment of the clip 68 on-the rod 66; then the end 'of the pen or pencil will'be introduced in the seat 44' and the plate. swung about the axis of the nut '22, the bar 68 being fixed'to the frame 33 andthe'clip 65-being fixed to the rod 66's0 that therod 66 will act as a link between the pivoted clip 65a nd its pivotal connection withthe bar 68.

It will be apparent that in view of the fact'that if the slide64is h'eld rigid in "the guide, there willbe ea 'slidingmovementimparted to the frame 33 as the plate 25 rotates about the axis of the nut 22. There'fore,the point44 will-scribe an ellipse, t-hesize'ofthe ellipse being determined by'the distance between the clip 65 and the bar 68.

The slide 64 can be secured against move ment or held in fixed adjustment by a latch lever 71, carried by the side bar 68. The extension frame consisting of the side bars 62 and 63 can be removed and the bar 68 may also be taken off so that the device can be operated without the ellipsograph f desired.

When it is desired to letter, the ellipsograph can be removed from the plate 2 and dicator point 72 can bemoved around the instrument may be placed on the T-' square, as shown, with the T-square preferably secured to the work by a thumb tack.

or' other suitable means. The locking lever 49 is then in released position and the inthe letter on the scale 29 which it is desired to make, which will indicate the proper slant to be followed, whether vertical, in-j clinedor horizontal, and the proper angle at Which these strokes shall be made.

It is understood that the horns 4:1 and 42 will be grasped by the hand of the operator while the pen held in his hand'will have its point resting in the crotch of bifurcated nary T-square or other appropriate guiding mechanism, and that it will be inexpensive to manufacture.

What I claim and desire to secure by Letters-Patent is: I

1.A device of the class described com prising a base, a rotatable plate on the base, a slidable frame carried by the rotatable plate, a slidable tool carrier on the slidable frame, means for fixing the rotatable plate rigid with respect to the base, and

means for fixing the slidable frame rigid with respect to its plate.

2. A device. of the class described comprising a traveling base, a rotatable plate mounted on the base, a ringmounted about the plate, means for fixing the ring rigid with respect to the base, a slidable frame carried by the rotatable plate, means for fixing the slidable frame with respect to the plate, means for removably securing a tool to one end of the plate, a plurality of ratchet bars longitudinally of the frame and having teeth to provide separate spacings for each bar, a detent carried by the plate and adapted to engage the teeth on the bars, the teeth being shiftable to align with first one bar and thenthe other, and means for moving the detent out of engagement with the teeth on the bars.

3. A. device of the class described comprising a main plate, a rotatable plate car-l ried thereby, a ring scaleabout the second named plate and having movement both independent thereof and therewith, a longitudinally movable frame on the rotatable plate, a tool carrier at one end of the frame, a rigid projection carried by the main plate, a bar on the frame, a rod carried by the bar, and means for pivotally connecting t I bar to the rigid projection. v

g. A device of the class" described comprlsing a main plate, a rotatable plate'carmain plate, a slide supported by the projection, av clip on the slide, a baradjustably mounted on the frame, and a rod adjustably connected to the clip. 7

by the plate, a rotatable plate carried by the main plate,.a scale ring about the r0 tatable plate, parallel guides-on the rotatried thereby, a longitudinally movable frame carried by the plate, a tool at one end-of the frame, a rigid projection carried by the,

5. A device of the class described compris I ing a plate, guide-engaging rollers carried able plate, a frame mounted in said guides,

rack bars carried by the frame, a detent carried bylthe rotatable plate for-engagee ment with the teeth on the rack bars, and means for securing a tool to one end of the frame. i

6. A device of the class described comprising a main plate, a rotatable plate 'carried thereby, a shiftable .scaleabout the rotatable plate, means for fixing the scale in adjusted position, a longitudinally movable frame carried by the rotatable plate, I and means for securing atool to one end of the frame. I

7. A device of the class described com prising a main plate, a rotatable plate car-o ried thereby, a shiftable scale about the rotatable plate, means for fixing the scale in. ad usted position, a longitudinally movable frame carried by the rotatable plate, a hand rest atone end of the frame, finger-engaging projections carried by the hand rest,

and a pen support carriedby the hand rest.

8.-A device of theclass described-comprising a main plate, a rotatable plate carframe carried by the rotatable plateand. adapted to rotate therewith, a "connection carried by the main plate and independently of the rotatable plate, means for linking ried thereby, a longitudinally movable theslidable frame with the connection, and l a" pen rest carried by one end of the frame. 1

In testimony whereof. I aiiix mysignature. i

OLIVER E. NOBLE, Y 

